Quantum wells with zero valence-band offset: Drastic enhancement of forbidden excitonic transitions.

A.V. Kavokin (1) , M.A. Kaliteevski (1) , S.V Goupalov (1) , J.D. Berger (2) , O. Lyngnes (2) , H.M. Gibbs (2) , G. Khritova (2) , A. Ribayrol (3) , A. Bellabchara (3) , Pierre Lefebvre (3) , D. Coquillat (3) , Jean-Paul Lascaray (3)

1 A.F. Ioffe Physical-Technical Institute
2 University of Arizona
3 GES - Groupe d'étude des semiconducteurs

Forbidden e1hh3 and e1lh3 exciton transitions (where hh and lh are heavy-hole and light-hole, respectively) appear in magnetooptical spectra of quantum wells that undergo a type-I-type-II band-alignment transition, here for ordinary (In,Ga)As/GaAs multiple quantum wells and a single CdTe quantum well with a (Cd,Mn)Te semimagnetic barrier exhibiting a giant Zeeman effect. The oscillator strength becomes so strong in a field of 11.25 T that vacuum-field Rabi splitting is clearly seen in reflection spectra when the e1lh3 exciton transition couples to the two-dimensional optical mode in a microcavity.

Domaines: Science des matériaux [cond-mat.mtrl-sci]; Optique [physics.optics]; Micro et nanotechnologies/Microélectronique; Optique / photonique

A.V. Kavokin, M.A. Kaliteevski, S.V Goupalov, J.D. Berger, O. Lyngnes, et al.. Quantum wells with zero valence-band offset: Drastic enhancement of forbidden excitonic transitions.. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 1996, 54 (16), pp.R11078. ⟨10.1103/PhysRevB.54.R11078⟩. ⟨hal-01233781⟩